private void PrepareDefaultStringFormat()
{
if (defaultStringFormat == IntPtr.Zero)
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipStringFormatGetGenericDefault(out defaultStringFormat));
}
}
private void PrepareGraphics()
{
if (graphics == IntPtr.Zero)
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipCreateFromHDC(hdc, out graphics));
}
}
public void Dispose()
{
if (graphics != IntPtr.Zero)
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteGraphics(graphics));
graphics = IntPtr.Zero;
}
if (defaultStringFormat != IntPtr.Zero)
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteStringFormat(defaultStringFormat));
graphics = IntPtr.Zero;
}
if (originalPen != IntPtr.Zero)
{
Gdi32API.SelectObjectChecked(hdc, originalPen);
}
if (originalBrush != IntPtr.Zero)
{
Gdi32API.SelectObjectChecked(hdc, originalBrush);
}
if (originalFont != IntPtr.Zero)
{
Gdi32API.SelectObjectChecked(hdc, originalFont);
}
}
private void DrawStringGDIPlus(Color color, FontConfig font, int x, int y, string text)
{
PrepareGraphics();
PrepareDefaultStringFormat();
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipCreateFontFamilyFromName(font.FontFamily, IntPtr.Zero, out var fontFamilyPtr));
try
{
FontStyle fontStyle = GdiPlusAPI.GetFontStyle(font);
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipCreateFont(fontFamilyPtr, font.Size, fontStyle, Unit.UnitPixel, out var fontPtr));
try
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipCreateSolidFill(color.ToArgb(), out var brush));
try
{
RectF rect = new RectF(x, y, 0, 0);
GdiPlusAPI.GdipDrawString(graphics, text, text.Length, fontPtr, ref rect, defaultStringFormat, brush);
}
finally
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteBrush(brush));
}
}
finally
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteFont(fontPtr));
}
}
finally
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteFontFamily(fontFamilyPtr));
}
}
private void FillRectangleGDIPlus(Color color, int x, int y, int width, int height)
{
PrepareGraphics();
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipCreateSolidFill(color.ToArgb(), out var brush));
try
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipFillRectangleI(graphics, brush, x, y, width, height));
}
finally
{
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdipDeleteBrush(brush));
}
}
public void Run(INativeWindowStartupInfo startupInfo)
{
GdiplusStartupInput gdiPlusStartupInput = GdiplusStartupInput.CreateV1();
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdiplusStartup(out var gdiPlusToken, ref gdiPlusStartupInput, out _));
IntPtr hInstance = Win32API.GetModuleHandleW(null);
var windowClass = new WNDCLASSEXW();
windowClass.cbSize = (uint)Marshal.SizeOf <WNDCLASSEXW>();
windowClass.lpfnWndProc = WindowProc;
windowClass.hInstance = hInstance;
windowClass.lpszClassName = WindowClassName;
var atom = Win32API.RegisterClassExW(ref windowClass);
if (atom == 0)
{
throw new InvalidOperationException("Failed to register window class.");
}
try
{
const int CW_USEDEFAULT = unchecked ((int)0x80000000);
IntPtr hwnd = Win32API.CreateWindowExW(
0,
WindowClassName,
startupInfo.Title,
Win32WindowStyle.WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
startupInfo.Width, startupInfo.Height,
IntPtr.Zero,
IntPtr.Zero,
hInstance,
IntPtr.Zero
);
if (hwnd == IntPtr.Zero)
{
throw new InvalidOperationException("Failed to create a window.");
}
var window = new Win32Window(hwnd, startupInfo);
windows.Add(hwnd, window);
startupInfo.OnCreate(window);
try
{
Win32API.ShowWindow(hwnd, Win32ShowWindowCommand.SW_SHOWNORMAL);
MSG msg = new MSG();
int mRet;
while ((mRet = Win32API.GetMessageW(ref msg, IntPtr.Zero, 0, 0)) != 0)
{
if (mRet == -1)
{
throw new InvalidOperationException("Failed to retrieve a message.");
}
Win32API.TranslateMessage(ref msg);
Win32API.DispatchMessageW(ref msg);
}
}
finally
{
// usually window will be destroyed before this point, unless error occurs
if (Win32API.DestroyWindow(hwnd) == 0)
{
// todo: log warning ?
}
}
}
finally
{
if (Win32API.UnregisterClassW(WindowClassName, hInstance) == 0)
{
// todo: log warning
}
// todo: use separate finally for GDI+
GdiPlusAPI.GdiplusShutdown(gdiPlusToken);
}
}
